Abstract A comparison of diesel spray for injectors with single-hole (SH) and multi-hole (MH) nozzles has been conducted under same rail pressure and similar injection rate (30 MPa for SH and 100 MPa for MH) conditions. The result showed that the spray of SH injector has a longer penetration under same rail pressure condition caused by the faster build-up process of sac pressure. The spray of MH injector has a larger spray angle resulted from the complicated nozzle flow. These further affect the evaporation rate and mixture formation process. Regarding the same rail pressure condition, the spray of SH injector shows a fast evaporation rate, as well as the MH injector, although the spray angle of SH injector is quite small. For the entire mixture formation process, more spray vapor of SH is distributed in the thin area. For similar injection rate condition, the effect of different spray tip penetration can be eliminated while the advantage of the large spray angle of MH injector becomes apparent. The evaporation rate and mixture formation process of the SH injector are much worse than those of the MH injector. The complex nozzle internal flow of MH injector is responsible.

中文翻译：

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单孔喷油器与多孔喷油器小喷油量柴油喷雾对比：相同轨压和相似喷油量下的结果

摘要 在相同轨压和相似喷射率（SH 30 MPa，MH 100 MPa）条件下，对单孔（SH）和多孔（MH）喷嘴喷油器的柴油喷雾进行了比较。结果表明，在相同轨压条件下，由于囊压建立过程较快，SH喷油器的喷雾穿透时间较长。由于喷嘴流动复杂，MH喷射器的喷雾具有较大的喷雾角。这些进一步影响蒸发速率和混合物形成过程。在相同的轨压条件下，SH喷油器的喷雾蒸发速度与MH喷油器一样，但SH喷油器的喷雾角度很小。在整个混合物形成过程中，更多的 SH 喷雾蒸汽分布在较薄的区域。对于相似的喷射率条件，可以消除不同喷嘴针入度的影响，同时MH喷射器大喷射角的优势变得明显。SH喷射器的蒸发速率和混合物形成过程比MH喷射器差得多。MH喷射器的复杂喷嘴内部流动负责。